List of top Physics Questions asked in MHT CET

The energy stored per unit volume is \( 0.3 \, \text{J/m}^3 \) when a wire is stretched by \( 0.125 \, \text{cm} \). When it is stretched by \( 0.75 \, \text{cm} \), the increase in potential energy per unit volume stored in the wire is

A vector \( \vec{F}_1 \) is a unit vector along the positive direction of x-axis and \( \vec{F}_2 \) is of magnitude 4. If the vector product of \( \vec{F}_1 \) and \( \vec{F}_2 \) is zero, then \( \vec{F}_2 \) is

The gate represented in the given figure is

Two vectors \( \vec{P} \) and \( \vec{Q} \) have equal magnitudes. If \( | \vec{P} + \vec{Q} | = 5 \) and \( | \vec{P} - \vec{Q} | = 4 \), then the angle between \( \vec{P} \) and \( \vec{Q} \) is

A thin wire of length \( L \) and uniform linear mass density \( m \) is bent into a circular loop. The moment of inertia of this loop about the tangential axis and in the plane of the coil is

Let \( R_1 \) and \( R_2 \) be radii of two mercury drops. A big mercury drop is formed from them under isothermal conditions. The radius of the resultant drop is

In a semiconductor, the number of holes and number of free electrons are represented as \( n_h \) and \( n_e \), respectively. Which one of the following statements is TRUE for the semiconductor?

If \( v_n \) and \( v_p \) are orbital velocities in \( n^{th} \) and \( p^{th} \) orbit respectively, then the ratio \( \frac{v_p}{v_n} \) is

A body situated on earth’s surface at its equator becomes weightless when the rotational kinetic energy of the earth reaches a critical value which is given by \( \left( M \text{ and } R \text{ be the mass and radius of earth respectively} \right) \)

The product of magnetic susceptibility \( \chi \) and absolute temperature \( T \) is constant for a

Average kinetic energy of \( H_2 \) molecule at 300K is \( E \). At the same temperature, average kinetic energy of \( O_2 \) molecule will be

In parallel plate capacitor, electric field between the plates is \( E \). If the charge on the plates is \( Q \), then the force on each plate is

A wire having a diameter of 3 mm is stretched by an external force to produce a longitudinal strain of \( 3 \times 10^{-3} \). If the Poisson’s ratio of the wire is 0.4, the change in its diameter is

A sonometer wire of length \( L \) between the two bridges vibrates in 3rd harmonic. Antinodes are formed at

A cord is wound round the circumference of a wheel of radius \( r \). The axis of the wheel is horizontal and the moment of inertia about it is \( I \). A block of mass \( m \) is attached to the free end of the cord, initially at rest. When the wheel rotates and the block moves vertically downwards through distance \( h \), the angular velocity of the wheel will be

Light rays are incident from air on a block of glass (Refractive Index = 1.5). The reflected and refracted rays are perpendicular to each other. The ratio of the wavelengths of the refracted and reflected light is

A ball at rest falls vertically on ground from a height of 5m. The coefficient of restitution is 0.4. The maximum height of the ball after the first rebound is

When a surface 1 cm thick is illuminated by light of wavelength \( \lambda \), the stopping potential is \( V_0 \). When the same surface is illuminated by light of wavelength \( 3\lambda \), the stopping potential is \( \frac{V_0}{6} \). The threshold wavelength for the metallic surface is

In a transverse progressive wave of amplitude \( a \), the maximum particle velocity is six times its wave velocity. The wavelength of the wave is

The period of revolution of a communication satellite is 24 hours. The period of a satellite in an orbit at a distance three times that of the earth’s radius above its surface will be

Two masses \( M_1 \) and \( M_2 \) are accelerated uniformly on a frictionless surface as shown in figure. The ratio of the tensions \( \left( \frac{T_1}{T_2} \right) \) is

A black body has maximum wavelength \(\lambda_m\) at temperature \(2200\,\text{K}\). Its corresponding wavelength at temperature \(3300\,\text{K}\) will be

A fixed number of spherical drops of a liquid of radius \(r\) coalesce to form a large drop of radius \(R\) and volume \(V\). If \(T\) is the surface tension, then the energy

A microscope will have maximum resolving power if, to illuminate the specimen, it uses light of

Five capacitors each of capacitance \(C\) are connected as shown in the figure. The ratio of equivalent capacitance between \(P\) and \(R\) and the equivalent capacitance between \(P\) and \(Q\) is